185240213 has 2 divisors, whose sum is σ = 185240214. Its totient is φ = 185240212.

The previous prime is 185240179. The next prime is 185240249. The reversal of 185240213 is 312042581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180821809 + 4418404 = 13447^2 + 2102^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-185240213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185240273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92620106 + 92620107.

It is an arithmetic number, because the mean of its divisors is an integer number (92620107).

Almost surely, 2^185240213 is an apocalyptic number.

It is an amenable number.

185240213 is a deficient number, since it is larger than the sum of its proper divisors (1).

185240213 is an equidigital number, since it uses as much as digits as its factorization.

185240213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 185240213 is about 13610.2980496387. The cubic root of 185240213 is about 570.0484343782.

Adding to 185240213 its reverse (312042581), we get a palindrome (497282794).

The spelling of 185240213 in words is "one hundred eighty-five million, two hundred forty thousand, two hundred thirteen".